5,301 research outputs found
W.S. Mackenzie, AE Adams : Atlas d'initiation à la pétrographie.
No full textW.S. Mackenzie, AE Adams : Atlas d'initiation à la pétrographie. . In: Revue de géographie alpine, tome 84, n°2, 1996. p. 117
W.S. Mackenzie, AE Adams : Atlas d'initiation à la pétrographie.
No full textW.S. Mackenzie, AE Adams : Atlas d'initiation à la pétrographie. . In: Revue de géographie alpine, tome 84, n°2, 1996. p. 117
aE Journal 2015/2016: aE/INTECTURE innovating architecture
No full textThe graduation studio of Architectural Engineering focuses on the integration of (new) technology in architecture. For this purpose, the name aE/ INTECTURE® was devised, which will be developed further as a brand in the coming years. Students start with a technical fascination and translate this into an architectural concept, finally being able to implement this within the environment in a responsible way. ‘If technology is the answer, what is the question?‘ Under the guidance of a team of enthusiastic (guest) lecturers, students search for the dot on the horizon that is necessary for coming up with solutions that improve the quality of the built environment and make it more sustainable. In addition, either the ‘making‘ (make) or ‘the energy and material flow’ (flow) is used and applied as a basis in different contexts.Architectural Engineerin
aE Journal 2017/2018: aE/Intecture innovating architecture
No full textDriven by the need to think differently about resources, energy, power generation, the choice of materials, and user involvement, we see the built environment in a new perspective. The program, Architectural Engineering, seeks for innovative and inspiring architectural solutions for social and environmental issues throughout all scales.To achieve this, innovation of the architectural challenge is high on our agenda. Innovation is more than just a technical improvement. How do you implement new current issues in modern architecture? We anticipate new energy, materials, and circularity. We also use the current environment of the metropolis and the countryside. We add new buildings, strengthen existing stock, and work on new components of buildings. From high to low tech. From digital to traditional, looking carefully to the context.Architectural Engineerin
Main motifs in the prose of the leftist author Kang Kyŏng-ae
No full textThe subject of this bachelor thesis is the life and work of the Korean writer Kang Kyǒng-ae, with a focus on her short prose. The aim of this thesis is an analysis of two works - Salt and Darkness - with attention to the context of the author's time. Nowadays, Kang Kyǒng-ae is considered a significant author of the 1930s and her works reflect the phenomenon of Korean emigrants in Manchuria. For a long time, leftist tendencies caused her prose to be neglected, which resulted in a considerably limited number of studies concerned with her work, in comparison to the number of studies about other writers. There are virtually no Czech studies of her work. The text of the thesis initially presents the timeframe of Kang's authorship and then analyzes select works of hers. The analysis of the works focuses on recurring motifs, which are put into a historical and social context. Keywords Kang Kyǒng-ae, Korean 1930s literature, leftist literature, Sogǔm, Ǒdu
Near-infrared Observations of Herbig Ae/Be Stars
No full textOne of the most open-ended philosophical questions a person can ask is ``Where did we come from? This question can be interpreted and approached from a multitude of angles. The work presented here will be investigating this question from the astronomical/physical perspective by studying the astronomical objects that are thought to be the immediate precursors to solar systems like our own. In order to determine how we came to be, we must first learn how our home was created.
My research area focuses on the study of the circumstellar disks around intermediate mass (2 - 8 Mʘ) young stellar objects, known as Herbig Ae/Be stars. These stars have been observed to harbor large disks of gas and dust left over from their parent molecular cloud. It is within these disks where planet formation is believed to be on-going. Our current models of planet formation are unable to fully depict the process of creating planets from the dusty, gaseous disk. Therefore, in order to understand how these disks create the planetary systems we now know to be ubiquitous, we must first improve our understanding of the composition of and physical processes occurring within the circumstellar disk.
Observing the molecular emission originating in the inner 10 au of these circumstellar disks allows us to understand the composition and physical environment where terrestrial planet formation is believed to occur. Molecular emission can provide a wealth of information on the inner disk. Observing multiple rovibrational transitions can give insight on the temperature of the gas. The emission line profile can also provide information on the location of the gas within the disk. The primary molecular species discussed in this research are OH, H2O, and CO. These are the three most abundant molecules present in the circumstellar disk behind H2, but all are more easily studied in the near-infrared wavelength regime.
In this dissertation, I present my findings on HD~101412. This source presented the first direct detection of water vapor emission in the near-infrared. Previous observations of Herbig Ae/Be stars have yielded detections of OH, yet water has been more elusive. Due to the strong far-ultraviolet radiation fields produced by the A and B-type central star, it is believed that most of the water vapor within the disk is photodissociated. This would increase the amount of OH within the upper layers of the disk atmosphere that are irradiated most directly. HD~101412 is also unique in that we observe it nearly edge-on and the gas-to-dust ratio is high compared to other Herbig Ae/Be sources. These factors combine to allow us to observe a larger column of water vapor in the disk which allows the emission to be observable above the continuum.
I also observed OH emission in the V380~Ori multiple star system to determine the variability of asymmetrical emission lines previously reported. The observation of multiple OH ν = 1 → 0 rovibrational transitions allow for the gas temperature to be determined. This, coupled with archival CO data, present information that point to a vertical temperature gradient within the V380~Ori circumstellar disk. Both the OH and CO emission line profiles show CO and OH to be co-spatially located, however, the OH gas appears to be hotter, thus higher in the disk atmosphere, than the CO emission. This is consistent with models that show OH should be more abundant in the upper atmosphere due to the irradiation from the far-ultraviolet radiation from the central star. Our observations are unable to reproduce the asymmetry previously reported in the OH emission. High-resolution CO emission also lacks the observed asymmetry. Due to the timescales on which these data were acquired, it can rule out the previously reported asymmetry being caused by an eccentric inner disk due to the presence of a stellar companion located within the molecular emission.
A survey on OH and H2O emission in Herbig Ae/Be disks, expanding on previous studies, is also presented here. Two more detections of water vapor emission are presented, along with five more detections of OH P4.5 (1+,1−). This increases the sample of OH detections in Herbig Ae/Be disks to 15 out of 31 (48.4\%) of sources with observations in the near-infrared. The relative strength of the OH and water emission is compared to different stellar and disk parameters of Herbig Ae/Be and T Tauri sources. This provides insight as to what could be the cause of the lack of water vapor emission observed around Herbig Ae/Be stars.
Finally, a survey of hydrogen recombination emission lines is presented in an effort to understand the physical origins within the Herbig Ae/Be system. Integral field spectroscopy is combined with spectro-astrometry to study the disk-star interface of Herbig Ae/Be stars. Two \ion{H}{I} emission lines are studied (Paβ and Brγ) to determine if they are produced directly by accretion onto the star, or if they originate from more extended regions of the system. Initially attempts are made to remove artifacts in the spectro-astrometric analysis via the use of models. Ultimately, it is concluded that these artifacts are not removed entirely. Later data is acquired such that artifacts can be removed organically via the combination of parallel and anti-parallel observing position angles. The emission lines observed in each observing run can provide some insights based on the overall line profile. Only the spectro-astrometric information from data acquired with parallel and anti-parallel observations can be relied upon to provide information on milliarcsecond scales
Biographical Romance, or The Wonders of ihe Life of An Émigrée of Choice: Fryderyk Járosy (1889–1960) – the Author of Unwritten Memoirs of Life Among the Polish Diaspora in London
No full textEnglish version. Original issue: “Archiwum Emigracji” 2009, no. 1 (10)https://apcz.umk.pl/AE/article/view/AE.2009.01
Autour du Nepos d'Alburnus, Maior, Panes, fils de Bizo (AE, 20081167=AE, 2007, 1201) : petit-fils ou neveu
No full textInternational audienceIn this article, the author studies again the inscription on a stone of a nepos from Alburnus Maior: Panes, son of Bizo (AE, 2008, 1167 = AE,2007, 1201). If the word nepos very often means « grandson », there are cases where it means « nephew ». The author pays special attention to the Latin kinship terminology in this inscription because names and lines are not Roman but peregrine. So, there is ambiguity as we cannot exactly know the relations between all these names. Now, between a grandfather and his grandson or an uncle and his nephew, there is the same number of generations. It is necessary for one to compare these to other inscriptions and words in addition to nepos (auia, auus, nurus, gener, pater, mater) or only with nepos in Rhenodanubian provinces (Raetia, Pannoniae, Moesiae, Dacia): these 67 inscriptions are in an appendix.The author concludes that the these two possibilities exist here
Performance evaluation of the Fiber Bragg Grating (FBG) sensing device and comparison with piezoelectric sensors for AE detection
No full textIn-service structural health monitoring (SHM) of engineering structures has assumed a significant role in assessing their safety and integrity. As the most mature technique in fiber-optic field, Fiber Bragg Grating (FBG) sensors have emerged as a reliable, in situ and nondestructive tool for monitoring and diagnostics in large-scale structure. Main objectives of this work are to evaluate and compare the acoustic emission (AE) sensing characteristics simultaneously with FBG sensor array and piezoelectric (PZ) sensors. The pencil-lead-break (PLB) test, ball dropping test and the excitation from the PZ transducer are treated as the AE source which conducted on the platy and blocky structure respectively for acoustic wave. The source repeatability will be verified to choose the source with more stable performance. A commercial 4-channel FBG AE detection device was used to compare with the PZ sensor on the amplitude and frequency response which can indicate the sensitivity of the sensors. The low sensitivity and low sampling rate are the main issue for the engineering application of the FBG sensors. Besides, the sensitivity and directional dependence of the FBG sensor have been discussed. It shows that the encapsulation method of the FBG sensor will impact both of them significantly.</p
Acoustic Emission as a Structural Health Monitoring (SHM) method for stay cables: Research into the possibilities of AE for stay cables of cable stayed bridges
No full textThe stay cables of the north bridge of the Galecopperbrug are reaching the end of their life span. Rijkswaterstaat, which is responsible for the bridges, needs a reliable Structural Health Monitoring (SHM) method to monitor the current state of the stay cables. At the moment, Rijkswaterstaat experiences issues with defining the state and the residual life span of the stay cables of the Galecopperbrug. This study focuses on the technique of Acoustic Emission (AE) for monitoring the stay cables of the Galecopperbrug. The main research question of this study was: “Is the AE-system used in a fracture-based assessment suitable for structural health monitoring of the stay cables of the Galecopperbrug?”. In this study the following methods were used to investigate the AE behaviour of stay cables: a literature study on previous research and the current knowledge of AE and the structural behaviour of cables was done, a full-scale and two verification experiments were performed to investigate the AE behaviour related to wire breaks and to investigate the accuracy of linear source location techniques, an analytical model of the stay cables was made to investigate the influence of different parameters to the capacity of the stay cables and to predict the stress distribution in the wires during the experiment and finally, a SCIA model of the Galecopperbrug was used to investigate the load bearing distribution of the Galecopperbrug. In this study, it was found that wire breaks inside (stay) cables will generate elastic stress waves which can be captured and recorded by AE sensors. Based on an experiment where multiple wire breaks occurred, it was shown that wire breaks can be identified with the help of AE techniques. However, the identification of wire breaks is mainly depending on the correct choice of sensor type. Based on the experiments and assumptions that were made in this study the R6I-AST type of sensors are more suitable for wire break detection and the R3I-AST sensors are more suitable for AE signals due to impacts. Based on the assumptions and the experiments performed in this study it can be concluded that AE can be used in a fracture-based assessment for SHM of the stay cables of the Galecopperbrug.Civil Engineering | Structural Engineerin
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